期刊
PHYSICAL REVIEW D
卷 85, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.075020
关键词
-
资金
- Fermilab Fellowship in Theoretical Physics
- US Department of Energy [DE-AC02-07-CH11359]
We extend the standard model to include a weak-triplet and color-octet scalar. This octo-triplet'' field consists of three particles, two charged and one neutral, whose masses and renormalizable interactions depend only on two new parameters. The charged octo-triplet decay into a W boson and a gluon is suppressed by a loop factor and an accidental cancellation. Thus, the main decays of the charged octo-triplet may occur through higher-dimensional operators, mediated by a heavy vectorlike fermion, into quark pairs. For an octo-triplet mass below the t (b) over bar threshold, the decay into Wb (b) over bar or Wb (s) over bar through an off shell top quark has a width comparable to that into c (s) over bar or c (b) over bar. Pair production with one octo-triplet decaying into two jets and the other decaying into a W and two soft b jets may explain the dijet-plus-W excess reported by the CDF Collaboration. Using a few kinematic distributions, we compare two mechanisms of octo-triplet pair production: through an s-channel coloron and through the coupling to gluons. The higher-dimensional operators that allow dijet decays also lead to CP violation in B-s - (B) over bar (s) mixing.
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